曝气生物反应器处理低碳氮生活污水的探究  

Study on Treatment of Low Carbon/Nitrogen(C/N)Domestic Sewage by Aeration Bioreactor

作　　者：宋亮 SONG Liang(Pingliang Ecological Environment Monitoring Center,Pingliang 744000,China)

机构地区：[1]甘肃省平凉生态环境监测中心,甘肃平凉744000

出　　处：《水处理技术》2022年第4期124-127,共4页Technology of Water Treatment

摘　　要：以农村实际低C/N废水为考察对象,构建膜序批式反应器(MSBR),探究了不同曝气强度(AI)对MSBR处理效能的影响。结果表明,AI显著影响MSBR处理低C/N废水的效能。当AI在1.0~5.0 m^(3)/(m^(2)·h)范围内时,AI 对化学需氧量(COD)的去除影响不明显,COD去除效率均在 89.5%~92.6%,可能与农村污水低 C/N 相关。然而,AI显著影响MSBR 对氮和磷的去除。AI 由 1.0~2.0 m^(3)/(m^(2)·h)提高至 3.0~4.0 m^(3)/(m^(2)·h),NH_(4)^(+)-N 去除效率由 81.6%~85.9% 提高至92.6%~94.1%,而进一步提高 AI 至 4.0~5.0 m^(3)/(m^(2)·h),NH 去除效率下降至 89.5%~91.2%。高曝气强度强化微生物内源呼吸,抑制微生物活性。适当提高AI利于提高好氧末期NO_(3)^(-)-N 的浓度,并强化后续反硝化,而高强度曝气降低 NO_(3)^(-)-N的去除。MSBR除磷的最佳AI为3.0~4.0 m^(3)/(m^(2)·h),溶解性正磷酸盐(SOP)的去除效率为 97.5%~98.9%。Membrane sequencing batch reactor (MSBR) was constructed to investigate the effect of different aeration intensity (AI) on the treatment efficiency of rural low C/N wastewater. The results showed that AI significantly affected the efficiency of MSBR in treating low C/N wastewater.When AI was in the range of 1.0~5.0 m^(3)/(m^(2)·h), AI had no obvious effect on the removal of chemical oxygen demand (COD), and the removal efficiency of COD was 89.5%~92.6%, which may be related to the low C/N ratio of rural sewage. However, AI significantly affected the removal of nitrogen and phosphorus by MSBR. AI increased from 1.0~2.0 m^(3)/(m^(2)·h) to 3.0~4.0 m^(3)/(m^(2)·h), NH_(4)^(+)-N removal efficiency increased from 81.6%~85.9% to 92.6%~94.1%, and further increased AI to 4.0~5.0 m^(3)/(m^(2)·h), NH_(4)^(+)-N removal efficiency decreased to 89.5%~91.2%. High aeration intensity can enhance the endogenous respiration of microorganism and inhibit the activity of microorganism. Appropriate increase of AI is beneficial to increase the NO_(3)^(-)-N concentration at the end of aerobic period and strengthen the subsequent denitrification, while high intensity aeration reduces the NO_(3)^(-)-N removal. The optimum AI of MSBR was 3.0~4.0 m^(3)/(m^(2)·h), and the removal efficiency of dissolved orthophosphate (SOP) was 97.5%~98.9%.

关 键 词：曝气强度 低C/N废水 膜序批式反应器 脱氮 

分 类 号：X703[环境科学与工程—环境工程]